The presence of endoskeleton is characteristic of:

Here's the answer to Q.14.

Q.14 The presence of endoskeleton is characteristic of:
An endoskeleton is an internal skeleton, typically made of bone or cartilage, that provides support and protection.

• A) Invertebrata is a diverse group, and most invertebrates do not have an endoskeleton. Many have exoskeletons or hydrostatic skeletons.
• B) Vertebrata (fish, amphibians, reptiles, birds, mammals) are defined by having a vertebral column and an internal skeleton made of bone and/or cartilage, which is an endoskeleton.
• C) Insecta (insects) are arthropods, and they are characterized by having an exoskeleton made of chitin, not an endoskeleton.
• D) Coelenterata (Cnidaria) like jellyfish and corals have hydrostatic skeletons or external calcareous structures, not endoskeletons.

Therefore, the presence of an endoskeleton is characteristic of vertebrates.

The final answer is $\boxed{\text{B}}$